Mathematics
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    8.15*3.14a-180sin(a)=72*8.15*3.14
    ln3:ln2
    ln3/ln2
    (x-2)+(x+2)+x/2+2x=45
    31*56
    (sqrt(472-57.6)-2)/3
    (sqrt(472-52.8)-2)/3
    sqrt(472-52.8)-2
    409600×0.8
    102400×0.8
    1000000+800000+640000+512000+409600
    12800×0.8
    640000-128000
    160000×0.8
    1000000×0.2
    20×0.8
    1000000×10%
    17x∧2-32x+15=0
    4096:2160
    (-3.6)^2-3.6*2-3

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